UPDATE: These statistics come to us courtesy of Gallup; I never thought legitimacy would be these disappointing.

DOUBLE UPDATE: By popular demand, the link above tells us the sample this poll is taken from:

"Results for this USA Today/Gallup poll are based on telephone interviews conducted May 10-13, 2012, with a random sample of 1,012 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia.
For results based on the total sample of national adults, one can say with 95% confidence that the maximum margin of sampling error is ±4 percentage points."